revert: prune: use Put(Current) mdbx's method instead of DelCurrent+Put#20643
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LGTM. If PutCurrent is causing incorrect behavior/regressions in this cursor path, reverting to the explicit DeleteCurrent + Put sequence is the safer choice on release/3.4. The branch conditions still preserve the original optimization: plain Put when the current step prefix differs, and only replace-in-place when the first 8 bytes match the current step.
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revert changes introduced in https://github.com/erigontech/erigon/pull/19914/changes
reason: just a moon-shot against "gas missmatch" error